diff --git a/engine/schema/src/com/cloud/storage/VolumeVO.java b/engine/schema/src/com/cloud/storage/VolumeVO.java
index ea3d6bffa67..8a5bf56816d 100755
--- a/engine/schema/src/com/cloud/storage/VolumeVO.java
+++ b/engine/schema/src/com/cloud/storage/VolumeVO.java
@@ -154,7 +154,7 @@ public class VolumeVO implements Volume {
     private Long vmSnapshotChainSize;
 
     @Column(name = "iso_id")
-    private long isoId;
+    private Long isoId;
     
     @Transient
     // @Column(name="reservation")
@@ -570,7 +570,7 @@ public class VolumeVO implements Volume {
         return this.isoId;
     }
 
-    public void setIsoId(long isoId) {
+    public void setIsoId(Long isoId) {
         this.isoId =isoId;
     }
 }